Disc cartridge with shutter overlapping gap having labyrinth shaped portion spaced to have a recessed dust deposition portion

Abstract

Disclosed is a disk cartridge capable of preventing the permeation of dust in the disk cartridge. A labyrinth shape portion having a recessed dust deposition portion formed in a gap at a portion between tilt planes for overlap of shutters are vertically overlapped to each other.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a cartridge suitable as a disk cartridge for housing or exchangeably housing a recording medium such as an optical disk or a magneto-optical disk, for example, an MO or DVD-RAM. In particular, the present invention pertains to the technical field of a dustproof structure for preventing permeation of dust in a cartridge of a type including a shutter for opening / closing an opening portion through which an insertion member such as a pickup or a disk table is to be inserted in the cartridge.[0002]FIG. 60 shows a related art disk cartridge 101 such as an MO, DVD, or DV-ROM. The disk cartridge 101 includes an upper shell 102 and a lower shell 103 between which a disk D such as an optical disk or a magneto-optical disk is to be rotatably housed. A slot-shaped opening portion 104 for insertion of a pickup and a disk table therethrough is formed along the lower shell 103 or along a central portion between the upper and lower s...

AI Technical Summary

Benefits of technology

[0009]An object of the present invention is to provide a cartridge capable of effectively preventing permeation of air containing dust in the cartridge through a gap formed at a portion where a shutter and the cartridge are overlapped to each other in a state that an opening portion is closed with the shutter.

Problems solved by technology

Accordingly, in such a shutter closed state, air AR containing dust DT is easy to permeate in the disk cartridge 101 through the opening portion 104 via small gaps 106 between both the ends 105a of the shutter 105 and both the side edges of the opening portion 104 of the disk cartridge 101, with a result that the dust DT is liable to adhere on the surface of the disk D. The adhesion of the dust DT on the surface of the disk D tends to cause errors at the time of recording and / or reproducing operation of data, and such errors are difficult to be corrected.

In this way, the permeation of the dust DT causes a problem in the high density recording disk cartridge.

The above-described dustproof structure, however, has a disadvantage.

The above-described dustproof structure, however, has problems that since the movement stroke (or opening / closing stroke) S2 of the shutter 105 becomes large, such a structure is unstable for the small-sized disk cartridge 101, and that it is difficult to prevent permeation of the dust DT composed of particles in the order of μm for the same reason as that described with reference to FIG.

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